%0 Journal Article
%T Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition
%A Ivan Marozau
%A Andrey Shkabko
%A Max D£¿beli
%A Thomas Lippert
%A Dimitri Logvinovich
%A Marc Mallepell
%A Christof W. Schneider
%A Anke Weidenkaff
%A Alexander Wokaun
%J Materials
%D 2009
%I MDPI AG
%R 10.3390/ma2031388
%X Perovskite-type N-substituted SrTiO3 thin films with a preferential (001) orientation were grown by pulsed laser deposition on (001)-oriented MgO and LaAlO3 substrates. Application of N2 or ammonia using a synchronized reactive gas pulse produces SrTiO3-x:Nx films with a nitrogen content of up to 4.1 at.% if prepared with the NH3 gas pulse at a substrate temperature of 720 ¡ãC. Incorporating nitrogen in SrTiO3 results in an optical absorption at 370-460 nm associated with localized N(2p) orbitals. The estimated energy of these levels is ¡Ö2.7 eV below the conduction band. In addition, the optical absorption increases gradually with increasing nitrogen content.
%K oxynitrides
%K strontium titanate
%K pulsed laser deposition
%K thin films
%K optical properties
%U http://www.mdpi.com/1996-1944/2/3/1388